Incidence (Epidemiology lecture)
short ppt to understand incidence. primary incidence rate, secondary incidence rate, incidence rate, examples of incidence, incidence rate related question are discussed in this lec.
2. Statistical Terms
Rate:
Rate refers to the occurrence of events over a
specific interval of time in a specific population
Example:
Number of deaths per 10,ooo population in one
year.
3. Statistical Terms
Ratio:
It shows relation in size between two random
quantities
Example:
Number of male deaths : No of female deaths
5. Incidence:
Number of new cases occurring in a defined
population during a specific period of time
Incidence calculation:
New cases in defined population
Incidence: x 10n
Total population at risk over a specific period of time
6. Incidence Rate
Occurrence of new events in a specific period of time
in a defined population
Formula: Same as incidence
New cases in defined population
Incidence Rate: x 100
Total population at risk over a specific period of time
7. Types of Incidence Rate
1) Primary Attack Rate:
Occurrence of new cases over a specific period of
time
New cases in specific period of time
Attack rate: x 100
Total population at risk in specific period of time
8. Secondary Attack Rate
Occurrence of new cases after primary cases in a
specific period of time
New cases after primary cases in specific
period of time
Secondary Attack rate: x 100
Total population (Minus primary cases) at risk
in specific period of time
9. Q ?????
Why we use x 10, x 100, x 1000, x 10,000, x 1,00,00
In Formula ?????????
10. Importance of incidence
It is helpful
๏ In pathogeneses
๏ to find disease distribution
๏ to control diseases
๏ in preventive and therapeutic measurements
๏ in health policies making